T.K. 55 years old: If you let your older 50-year-old wife get drunk and leave it alone with her younger subordinates

My wife is a 55-year-old housewife. What I'm worried about is whether my wife is happy about sex. However, she has a firm and serious personality, so she is a woman who does not have anything like an affair. I was worried whether my wife really didn’t want to have sex, or if she just wouldn’t show that attitude in front of me.